JPH05193360A - Bag shape heming structure - Google Patents

Abstract

PURPOSE:To fulfil the function of a core metal when an outer press part is bent on an inner press part by thickening the inner press part more than the outer press part. CONSTITUTION:An outer press part 9 is bent along the bent line and the top end of a bent end part by making the bent end part bent in advance of an inner press part 8 thicker than that of the outer press part 9 as a core metal. Therefore, without the use of another core metal, the end part 24 of the outer press part 9 is formed so as to wrap the bent end part 23 of the inner press part 8 bent in advance, in a bag shape swelled in the plate thickness direction of the assembly of the inner/outer press parts and also a plane part 25 extending in the plate thickness direction is formed on the outside surface of a bag shape Heming structure. The plate thickness of the Heming structure can be incresed by making this Heming structure in a bag shape, and a sufficient length can be secured as a seal part on the outside of the Heming structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemming structure of a pressed steel sheet and is intended to improve the performance of the hemming portion as a product.

[0002]

2. Description of the Related Art Generally, the panel portion of an automobile body is
An inner press product with a relatively strong corrugated sheet structure is used to support the outer press product consisting of a flat thin plate that constitutes the outer surface of the vehicle, and the end of the outer press product is folded back to the edge side of the inner press product. Has been processed into a hemming structure. In the hemming part as the edge of this panel part,
A good sealability against rainwater is required when joining with other members.

The conventional hemming structure is a folded hemming structure as shown in FIG. 1, and the outer press product 2 is formed along the thickness of the inner press product 1 around the edge of the inner press product 1. Since it was folded back, the plate thickness of the hemming portion 3 could not be taken. Therefore, at the time of joining with the other member 4, the other member 4 is extended to the panel 5 side having the hemming portion 3 and the sealing portion 6 is provided on the panel 5 in order to provide a certain length of the sealing surface and ensure the sealing performance. Had to be applied to the inner surface of the. In such a structure, a groove is formed between the outer surface of the hemming portion 3 and the other member 4, and water is likely to collect in the groove. Therefore, in order to secure sufficient sealing performance, the sealing portion 6 should be large. At the same time, a special device was required for the extension of the other member 4. Particularly, in the sunroof panel portion, that is, the panel 5 in FIG.
Is a roof panel and the other member 4 is a sunroof panel, the sunroof panel 4 is extended to the lower side of the roof panel 5 and the sunroof panel 4 cannot be directly opened to the upper side in addition to the problem of the sealing property. There was a problem.

In order to solve the above problems, in Japanese Utility Model Laid-Open No. 56-105429, the outer press product end portion is folded around the inner press product end portion and hemmed. There is disclosed a structure in which the seal is bent at a right angle from the horizontal part (this bending is not a hemming process) so that the seal part has a certain length. For the time being, with this structure, no groove was formed in the vicinity of the seal portion, and the above problems could be solved.

[0005]

However, in this structure, there is a problem that a corner is formed at the lower end of the bent hanging part, and when a person tries to lift this corner by hand, it is difficult for the person to push in and the appearance is not good. Besides, since the bent hanging part is supported in a cantilever form at the bending point of the upper part, the hanging part tends to tilt when a horizontal force is applied to the hanging part, and if tilted, the sealing performance deteriorates. After all, the sealing property cannot be solved. As a further problem, one step is added for the bending process even in the manufacturing process, which violates the request for shortening the process.

Therefore, there is a demand for improving the hemming structure to expand the hemming portion in the plate thickness direction to solve the above problems. In the method for manufacturing the hemming part for expanding the hemming portion in the plate thickness direction, an outer press product is usually formed by bending. However, there is a problem in that a cored bar or the like is additionally required, which complicates the work.

It is an object of the present invention to provide a hemming structure which is inflated in the plate thickness direction and can easily form a desired hemming portion without using a core metal or the like.

[0008]

In order to achieve this object, in the bag-shaped hemming structure of the present invention, the outer press product is thicker than the outer press product and the pre-bent end of the inner press product is used as the core bar. It is bent along the bending line and the tip of the part. Therefore, without using a separate core metal, the outer press product end is inflated in the plate thickness direction of the inner and outer press product assembly so as to wrap around the bent end of the pre-bent inner press product. And a flat portion extending in the plate thickness direction is formed on the outer surface of the bag-shaped hemming structure.

[0009]

In the hemming structure having such a structure, the thickness of the hemming structure can be increased by forming the hemming structure into a bag shape, and a sufficient length as a seal portion is secured on the outer surface of the hemming structure. Since the flat portion is formed on the outer surface of the hemming structure, the sealing material can be sufficiently adhered, and the outer surface of the hemming structure can be a sealing surface that can exhibit sufficiently good sealing performance. Become. By setting the seal portion on the outer surface side of the hemming structure, it is possible to remove the groove that is formed in the conventional joint portion and tends to accumulate water, and therefore the sealing performance is further promoted. Further, the bag-shaped bulging hemming structure has a good appearance and is of high commercial value, and the corners at the lower end are not sharp, so that it is not difficult for a person to touch. In addition, since the tip of the bag-shaped bent part of the outer press product is crimped to the inner press product, the flat part of the bag-shaped bent part is supported by both the upper and lower ends, and even if horizontal force acts, tilting occurs. Difficult and reliable seal. Further, if the hemming structure of the present invention is applied to the joint portion of the roof panel with the sunroof panel, it is possible to eliminate the need for an extension portion for the seal of the conventional sunroof panel together with the good sealing property. Direct opening to the upper side is also possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the bag-shaped hemming structure of the present invention will be described below with reference to the drawings. First, FIG. 2 and FIG. 3 show the structure of a processing apparatus having a bag-shaped hemming structure according to an embodiment of the present invention. FIG. 2 shows the entire apparatus, which is shown in FIG.
Is a lower die on which the inner press product 8 and the outer press product 9 stacked on the inner press product 8 are placed, and is fixed on the lower surface plate 10. Above the lower mold 7, an upper mold 11 for sandwiching and fixing the inner press product 8 and the outer press product 9 with the lower mold 7 is provided.
Is fixed to the lower part of the upper surface plate 12. The upper die 11 is a guide having an end portion of the outer pressed product 9 and a side surface that can be bent downward with the inner pressed product 8 having a plate thickness larger than that of the outer pressed product 9 (see FIG. 4) as a core and extending vertically. A section 13 is provided.

On the side of the lower die 7, a hemming blade 14 is obliquely directed toward the bending end of the outer press product 9 placed on the lower mold 7 together with the inner press product 8 by the guide portion 13. , Movably provided. The hemming blade 14 is fixed to the moving bracket 15 and is movable together with the moving bracket 15. The moving bracket 15 is slidably supported by a guide 16 provided obliquely on the frame portion of the lower surface plate 10, and the cylinder 1 fixed to the frame portion of the lower surface plate 10 is provided.
The rod end of No. 7 is connected via a knuckle portion 18, and can be linearly reciprocated along the guide 16 by the operation of the cylinder 17.

The hemming blade 14 has a thick plate structure extending in the vertical direction, and has a flat surface 20 in the horizontal direction on the upper end surface 19 and a hemming blade bent from the flat surface 20 to the diagonally lower side of the cylinder 17 side. A slope 21 extending in the moving direction of 14 is formed. The flat surface 20 has a hemming blade 1
4 is moved diagonally upward by the cylinder 17 so that the crimping portion of the flat surface 20 toward the lower surface of the inner press product 8 is positioned at a proper distance from the side surface of the guide portion 13. The positional relationship of the devices is determined. Reference numeral 22 is a stopper for the upward movement of the moving bracket 15, and the stopper 22 regulates the pressing margin of the flat upper surface 20 of the hemming blade 14 toward the lower surface of the inner press product 8.

Next, a hemming structure manufactured by using the above apparatus will be described. FIG. 4 shows a hemming process sequence. The end portion is bent downward at a substantially right angle to form a flange 23, and the whole has a corrugated plate structure for securing strength, and on the inner press product 8 having a core metal function by making the plate thickness larger than the outer press product plate thickness. The outer pressed product 9 is overlapped, and the end of the outer pressed product 9 is a flange longer than the bent end 23 along the bent end 23 of the inner pressed product 8 by the guide portion 13 as the upper mold 11 descends downward. It is bent into a shape 24. After that,
The hemming blade 14 is advanced obliquely downward from the bent end 24 extending downward of the outer pressed product 9, and the bent end 24 is further bent obliquely upward toward the lower surface of the inner pressed product 8. That is, the hemming blade 14 that has been advanced by the operation of the cylinder 17 from diagonally below is
First, the upper end corner is first located at the position 24-1 shown by the broken line in FIG.
In the vicinity of the lower end of the bent end portion 24 of the outer pressed product 9 in FIG. 2, the hemming blade 14 further advances and pushes the side surface of the bent end portion 24 to move the bent end portion 24-2, 24.
Bend to the -3 position and eventually the hemming blade 14
The hemming blade 14 advances until the upper end flat surface portion 20 of the upper end presses the tip end of the bent end portion 24 against the lower surface of the inner press product 8, and the advancement is stopped by the stopper 22.
The position of 24-4 is reached, and the hemming processing of the end portion of the outer pressed product 9 is completed.

In the outer press product 9 having the hemming structure processed in this manner, the tip of the bent end portion 24 of the outer press product 9 is crimped to the lower surface of the inner press product 8 so as to finally sandwich the inner press product 8. .. Outer press product 9
There is a space between the portion that is bent obliquely upward and the inner press product 8, and a bag-shaped hemming structure that is inflated into a bag shape is obtained. In addition, the bent end portion 24 of the outer pressed product 9 is the bent end portion 2 of the inner pressed product 8.
3 Since the guide portion 13 bends along the outer side surface and the outward deformation of the bending end portion 24 at the time of bending is suppressed, the outer surface of the bag-shaped hemming structure, that is, the outer side surface of the hemming portion on the guide part 13 side is formed. A plane portion 25 extending in the vertical direction is formed. Therefore, the hemming structure is in the shape of a bag and has the flat portion 25 on the outer surface. Due to the bag-shaped bulge, the dimension of the inner and outer press assembly in the thickness direction is greatly increased compared to the conventional folded hemming structure, and the length of the outer surface extending in the vertical direction is the seat surface. Is secured to a sufficient size, and a flat portion is formed on the outer side surface thereof, so that sufficient contact with the sealing material is possible. This hemming structure ensures a good sealing property with other members.

The bag-shaped hemming structure of the present invention is not limited to that of this embodiment, but is formed in a state in which the end edge of the bent end portion 24 of the outer press product 9 is slightly folded back as shown in FIG. 5, for example. As shown in FIG. 6, an inner press hose 26 (considered as part of the inner press product 8) is sandwiched between the inner press product 8 and the crimping portion of the inner press product 8 of the outer press product 9. The folded portion 2 of the outer press product 9 has a bag-shaped hemming portion, and a flat portion for a sealing surface is formed on the bag-shaped outer surface.
It suffices that it is manufactured so that the tip portion of 4 is crimped to the lower surface of the inner press product 8.

In order to further clarify the hemming structure of the present invention in which a good sealing performance is ensured in joining with other members, a more specific application example will be described. 7 and 8, the roof panel 27 is formed at the joint between the roof panel 27 and the sunroof panel 28 of the vehicle.
The side to which the bag-shaped hemming structure of the present invention is applied is shown.
As shown in FIG. 8, since the end of the roof panel 27 has a bag-shaped hemming structure, the thickness of the hemming structure is significantly increased as compared with the conventional one.
8 Sealing surface 3 with the sealing material 29 interposed between the ends
Since 0 can be used as the outer surface of the hemming portion, the conventional extension portion on the sunroof panel 28 side as shown in FIG. 1 is unnecessary. Moreover, since the sealing surface 30 on the side of the hemming portion is formed to be a flat surface, it is possible to achieve sufficient close contact with the sealing material 29 and obtain good sealing performance. Also, the sealing material 2
Since 9 is interposed between the end portions of the roof panel 27 and the sunroof panel 28, the groove or the like as shown in FIG. 1 in which water tends to collect is not formed, and good sealing performance is further promoted. Further, since the conventional extension portion extending to the lower side of the roof panel 27 on the side of the sunroof panel 28 is unnecessary, the structure is greatly simplified, and the sunroof panel 28 can be easily opened directly upward. The opening operation is greatly simplified.

[0017]

According to the bag type hemming structure of the present invention, the thickness of the inner press product is made larger than the thickness of the outer press product, so that the inner press product can have a core metal function when the outer press product is bent. A flat surface with a bag-shaped hemming part to increase the distance in the thickness direction of the assembly of the inner and outer pressed products of the hemming part, and a sufficient length as a sealing surface on the outer surface of the bag-shaped hemming part It is possible to form a part. For this reason,
With this hemming structure, good sealing performance can be obtained without special measures for joining with other members.
In this puffy bag-shaped hemming structure, since the tip of the bent portion of the outer pressed product that is bent and extended obliquely upward is crimped to the inner pressed product, the flat surface portion is supported at both upper and lower ends, and horizontal force is applied. Even if works, it does not tilt easily and has good sealing properties. In addition, the puffed bag-shaped hemming structure has an advantage that it has a good appearance and a high commercial value, and that even if it is touched by a person, the end portion is not easily dented. Further, when the hemming structure of the present invention is applied to the joint portion between the sunroof panel and the roof panel of the vehicle, good sealing performance can be obtained and the sunroof panel can be directly opened upward.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional hemming structure.

FIG. 2 is a side view of a processing device for a bag-shaped hemming structure according to an embodiment of the present invention.

FIG. 3 is a partial side view of the device of FIG.

FIG. 4 is a side view showing a processing sequence of hemming processing by the apparatus of FIG.

FIG. 5 is a side view of a hemming structure showing an application example of the hemming structure manufactured by the present invention.

FIG. 6 is a side view of a hemming portion showing another application example of the hemming structure of the present invention.

FIG. 7 is a perspective view around the sunroof panel portion of the vehicle.

8 is a cross-sectional view of the device of FIG. 7 taken along the line VIII-VIII.

[Explanation of symbols]

 7 Lower Die 8 Inner Pressed Die 9 Outer Pressed Die 11 Upper Die 13 Guide Part 14 Hemming Blade 15 Moving Bracket 16 Guide 17 Cylinder 19 Hemming Blade Top Surface 20 Hemming Blade Top Surface Flat Surface 21 Hemming Blade Top Surface Slope 22 Stopper 23 Bent end of inner pressed product 24 Bent end of outer pressed product 25 Flat part of outer surface of hemming part 27 Roof panel 28 Sunroof panel 29 Sealing material 30 Sealing surface

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B60J 10/10 10/12 B62D 25/06 Z 7816-3D 65/00 G 8211-3D

Claims (1)

[Claims] 1. A hemming structure in which an end of an outer press product for a vehicle is folded back and an end of the inner press product is sandwiched by the outer press product, and a material having a larger plate thickness than the outer press product is used for the inner press product. The end of the product is bent at a right angle in advance, and the hemmed portion of the outer pressed product is formed into a bag shape in which the folded end of the inner pressed product is inflated in the plate thickness direction, and
The bag-shaped outer-pressed product is characterized in that the bent end portion is crimped to the inner-pressed product, and a flat portion extending in the plate thickness direction is formed on the outer surface of the bag-shaped hemming portion of the outer-pressed product. Hemming structure.